/*
Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
- This program is free software; you can redistribute it and/or modify
+ This file is part of DCP-o-matic.
+
+ DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
- This program is distributed in the hope that it will be useful,
+ DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
, _stream (stream)
, _decoder (decoder)
, _log (log)
+ /* We effectively start having done a seek to zero; this allows silence-padding of the first
+ data that comes out of our decoder.
+ */
+ , _seek_reference (ContentTime ())
{
if (content->resampled_frame_rate() != _stream->frame_rate() && _stream->channels() > 0) {
- _resampler.reset (new Resampler (_stream->frame_rate(), content->resampled_frame_rate(), _stream->channels (), decoder->audio->fast ()));
+ _resampler.reset (new Resampler (_stream->frame_rate(), content->resampled_frame_rate(), _stream->channels ()));
}
reset_decoded ();
Frame const end = frame + length - 1;
- if (frame < _decoded.frame || end > (_decoded.frame + length * 4)) {
- /* Either we have no decoded data, or what we do have is a long way from what we want: seek */
- seek (ContentTime::from_frames (frame, _content->resampled_frame_rate()), accurate);
+ /* If we are less than (about) 5 seconds behind the data that we want we'll
+ run through it rather than seeking.
+ */
+ Frame const slack = 5 * 48000;
+
+ if (frame < _decoded.frame || end > (_decoded.frame + _decoded.audio->frames() + slack)) {
+ /* Either we have no decoded data, all our data is after the time that we
+ want, or what we do have is a long way from what we want: seek */
+ _decoder->seek (ContentTime::from_frames (frame, _content->resampled_frame_rate()), accurate);
}
/* Offset of the data that we want from the start of _decoded.audio
padded->copy_from (data.get(), data->frames(), 0, delta_frames);
data = padded;
time -= delta;
- } else if (delta_frames < 0) {
- /* This data comes before the seek time. Throw some data away */
- Frame const to_discard = min (-delta_frames, static_cast<Frame> (data->frames()));
- Frame const to_keep = data->frames() - to_discard;
- if (to_keep == 0) {
- /* We have to throw all this data away, so keep _seek_reference and
- try again next time some data arrives.
- */
- return;
- }
- shared_ptr<AudioBuffers> trimmed (new AudioBuffers (data->channels(), to_keep));
- trimmed->copy_from (data.get(), to_keep, to_discard, 0);
- data = trimmed;
- time += ContentTime::from_frames (to_discard, frame_rate);
}
_seek_reference = optional<ContentTime> ();
}
_seek_reference = t;
}
}
+
+void
+AudioDecoderStream::set_fast ()
+{
+ if (_resampler) {
+ _resampler->set_fast ();
+ }
+}